Anatomically shaped vasoocclusive device and method of making the same

Abstract

This invention is an occlusive device for inserting into body cavities or vesicles. More particularly, it is a vasoocclusive device which, as used, is in the approximate shape of an anatomical cavity. It may be ultimately deployed as a substantially spherical shape in the operable configuration. The device is a self-forming shape made from a pre-formed occlusive strand of flexible material. The occlusive strand may be helically coiled or braided and may be adapted with various polymeric fibers. The device is typically introduced through a catheter in the substantially linear inoperable configuration. The invention provides a plurality of such substantially spherical strand portions which nest concentrically with each other in the operable configuration. The invention also includes methods of producing and using the substantially spherical occlusive devices.

What is claimed is: 
     
       1. A method of making an occlusive device comprising a strand of a flexible material movable between an inoperable substantially linear configuration for insertion into and through a means for delivering the device to a desired portion of a vesicle, and an operable, substantially spherical configuration for occluding at least a portion of said vesicle, the method comprising the steps of: winding a strand of flexible material including a radiopaque material onto a core having a substantially spherical form;   heating the core and the strand to impart a substantially spherical form to said strand; and   removing said strand from said core, thereby producing said occlusive device.   
     
     
       2. The method of claim 1, wherein said step of heating comprises heating the core and the strand to approximately 1100° F. 
     
     
       3. The method of claim 1, further comprising the step of connecting at least one fiber connected to said strand.